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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8870ed1c19bcea81cae5ad782f3bdb5df45ab3d358852b8fc2624c812803c2e0' 
  AND token = 'CNS0c7ga8YElx04cad5kL+6dPMnI/OjvKHtayHtX6b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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