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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da23c3c0781571896d26749ad6d84080564c81c4c98fb39b5c513b19921f7000' 
  AND token = 'Ldg/NDzGsf9BpyV8slAurlEtfHt8A1AdkfJwSOdXGEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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