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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a02f2fb026731e995e2e0109910c7e32c8245e56a1073e9701a343a9a3c102' 
  AND token = '8QqXp9qAfof8lAIA1vX2srTYPtHoqtfWTLRt5kj4ZvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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