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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '637ae80152167365517ab72dc1ab4f644cf882e56687f7489f3e2e99e1a4ba01' 
  AND token = 'MpSlqVwhyNhwgG4Y2dE7Qu/R2zMZsa7Ic3bSSyRrQaA=' 
  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"
    }
  }
}