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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58b72b022578b3c1046d3f773f022f52dbf74da56b2681b59c6ccf8e2370673' 
  AND token = '8tiH1roPYC5fHtfFh5FlWWoRESzbgLheENApSP97jzw=' 
  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"
    }
  }
}