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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27bf4a370ca42e1d3d4936a83f088c6911aa6b32e403fa8d3e9665c00fb3eff7' 
  AND token = 'Xjo/6MD8Sp14kANMLSRcP4I0VcAA/QtiuxsLIAHHpHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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