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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5d4ee074ecd6b83672bafae855f54c2e85e9cb6f9d7449fe87e4828e6e1bf1' 
  AND token = 'lTNf1PB+Ri3m8An6g0YOnhwmFj5wx4Jys7FUtInp+8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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