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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7786c595a9e0c99e221584bc85ae1b3939130a49cdb09bdecfaaac81d1a41b6f' 
  AND token = 'Ea8jwbuctS5Nh+gZpPKyJusXSiKv+TioJoH5oCdP1Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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