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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5a9bd23d48613860ed387a085d70b2302cf6a53a02cfca934ff886376c1b99' 
  AND token = 'HwpZunl/fh+aeQnWF3AKG4JAQbGSLBG3Pr5a37QWB9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}