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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87856ea3f527c0d3d854753c215da85369924b922eb1da44e116f8b4ed7e9219' 
  AND token = 'pmi1PAFR35lYZpkJssB1nDV1BAostUpTx2vXbv7ikXo=' 
  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"
    }
  }
}