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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6620a306852ae5ff16c9f51168000950de57d75c5ef46bcc44f39b65150573a' 
  AND token = '/Q6v54MZC+drSw2GFQbdrqnUKEjdgBBc1HL/yS5dSNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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