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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919f16686ae0274e5f97922b268dadeff3c01e8639d72c7a2df180dd92737eeb' 
  AND token = 'x56gbX0U7Y0CXQ1AeIr1e30DOOVRhCGf/w9Yr7mtpYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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