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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269186cdf59c1fbd519e0bf39a48ba2a9cc3c746e44928cf7a7d16c98ba3aafb' 
  AND token = '9j4i7aSFo/l5hqFC0iyZ/CxCUNRMRn9ZgIrWdp7CyVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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