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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac450fd7e2037103d7f64b5e1020910c3316ca23fd675279f9fe09f6edcdff93' 
  AND token = 's9mhbv26g41h1vgeXLygHL9wQpxclVpr7Pyo5EAPiyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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