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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cdbded2e4f67241b7a5fe341b82b9fa866dc09322ac1d99848776c67b6f7a2' 
  AND token = 'l6EJbhXNu+e2BoTj2qP/kComcK7adie+C0hcl0LYaq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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