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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2fcbad3e67f1cc4fa61d73940fda2b7e4dd545b120f18de12ff3a23159f8c0' 
  AND token = 't52JtN30B5IYk7OMdMoedIVZWgkYP7MOAxKnzfllOw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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