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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ecd432ffa854ad197a90d35f5d37caab9ec55a82b9fd2d8d20797b9f146287' 
  AND token = 'fSIZP67h7q0toWHYKpv6VgNALQa5gAQhdOAvesZl6Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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