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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bb21296f7e8d9507e1bc5398e10cf79d6fc575d9552f9f1073dc3f971481dd3' 
  AND token = 'Q9YuhZuKYabu52hAkfj5S2cdVMMANMthnUT10Uk03kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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