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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387c0bf5e3732d8ede543927d5dd7ecae311bbf09f9ba2c8cd3b78020fa67fe4' 
  AND token = 'we2aXMNA+6e71jznxQ6DnOJxqIdow2iLpRLkak983GA=' 
  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"
    }
  }
}