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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d89c4d61ba523c17997c8decfdbb53dec18a420581a1e81cf94b1ca23c1540d' 
  AND token = '4Rz5GD7RC6jKM6ERZJlf5+Z5IxoNlpp6HnCReoYNeyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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