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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd934aa6d71681e05a70810733458a21f4d632de359e74d25983b1b75e80d1869' 
  AND token = 's4vOH4RYioZ95B5GczrIJZ2NZNB6emU4H20Ix8z2M78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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