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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea8c3924d7bfa7cad68d329945f37a7bc319e76a23e14f7e5c50f30b51d447c' 
  AND token = '2tlsEfFzaLQDTW+k6gYhzwtnMRHIQ2gmoM6aChCTWyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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