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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff45b019ff5ede78631ad7921f5a94969bb80d868d09f207e5c3280b45e57d4c' 
  AND token = 'iq91jKAdw05TBRfPlppy4frGFx+RHcUsISi/PWjyG4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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