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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f106b692aa5c5a54d35a0a0e3cdf464e781522f9eedea0067b5098797ce82df' 
  AND token = 'Biqgc41TfwShhjV3a5I5KsyQzDb+kcE4bQku/INETJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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