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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec51f6430eba64ddcb93382beeb6cbb5b8adb056fcc7d8bcb5191da7bd9cc3e' 
  AND token = '+DVa10Fzc0GOk/XpJyMX3zTmyfVH03yVP746IswABv4=' 
  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"
    }
  }
}