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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b06bdef85d80bc089083b4f4ca22f621e0fbb63c86ca5b69294c2dc7ad3e98' 
  AND token = 'pj3t9hTRc33rnN3GyS+wTX7RTS8nFK0SuKLOLx+Ij0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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