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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96490530a39d79b5d4ff2c0352d557737b385ba88d034d892a94e9e5dacb581a' 
  AND token = 'eySYMemH/0sC/kuUzvuSingevztg//GWH2ZfGfpnRkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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