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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb276b3914d8567646541edf5fab7f53079451999378c7af82ed8845475782c4' 
  AND token = 'elRaf4IwKNv5fqbUIAMt4PXNhnCO4YV5sReoz2j3KD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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