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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6353247cab05092185f55c8a976cd972c0c7dff22dbce2170908ce0296540e0c' 
  AND token = 'gjZoCF+IijQduscF9nZBnnkxAZ4TVN6Q2KMLC3y4C4g=' 
  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"
    }
  }
}