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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a51b147ed524b34856921f98f54941245b357b349f63cc2143b1414bf7ac434' 
  AND token = 'Pq6GQ6HAN6HEj52dWVKSm5Wxcwikcos4fqxOwOuGnCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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