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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d810855cf5eb815635b5b652f3b60369d1ecb51e3fb21dc8292efa64881a2c' 
  AND token = 'zwcjcfiUHQ5HgcbeoDNvG9L7X1A7IvYvfv4e/FpGjLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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