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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9895adf40aba25cae01e197d6b80932e110cc0abe20876cd5fa64cd59e9f590' 
  AND token = 'ZxglUwHuQSzXAOzM0b7AIw8EvvUIxvm4si+9o6Qfp9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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