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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47f264390d03e5954c9c50fee7a6b49c3467d0e9ef6e8c56d98dc132efdb148' 
  AND token = 'M23oMtywI1COzAEQX7GE9cuYE3ZzPUVhqHQpkq5QLeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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