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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736385e8e3b4a8e01e7f63b12104f5946f7ab554c1db477206b64f42835191a3' 
  AND token = 'f2ZpdtIXCCL7KSUvN8WYCaf38/wRA7zY8EPVB81p1kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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