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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f60a6e24b2508b0b11d05397f8cccf1e28cf1b31d401e485c6df6bb9fc41970' 
  AND token = 'lRCSfC7UBdQ9GlvW1LJ9rN4niU1oHhQwdED5yvYbyQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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