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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71505b612451bad8e416790b20a2c54051deb22d1dd06073d3fbbae605502ec' 
  AND token = '9hluLNmUJc5aJq2xMg2z/Gyt1jWuWrbC687NtXE7uFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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