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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342e0b609d6a7bf3cbc30e51f7cc23d01afa9b2b25f44161906b0aaa992570c8' 
  AND token = 'RbOXcAHAc8T7okM2jsZU+OdrDI58/8D7cTziWklynbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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