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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '280358c7628a9dcaf3adc39092d626e37bdae6da93f0369b39f1ad37e3cfd0ee' 
  AND token = 'anuWyzvrAOSozQWcrFTZltxW1dW54+StF7d/Lz1u53A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00301

JSON explain

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