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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62d437be615a24f4fbd95fa70212be45eb4a584126223f71d14e5a796fbc932' 
  AND token = '7dm7nNOhnzH9ytuhIFNrhs9KPkiqIqaRu2Ee16uc3mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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