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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c1ea6fbc3a33b23367b92b75a6ba929e621f5fc5b3fbc1d5d2e5f8aff7322c' 
  AND token = '3PZVeq/LuIU508R7Ztp2xgHCCpX/vpxLyt+gvTo9C6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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