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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4d93b03b5542025256245f5fb957588cdfbaf7b104541ac3d2330d1e501bed' 
  AND token = 'H6wjc6KwvcBQ/P2aZm2l6rRgipn3anNFwk9s0b4tlYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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