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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe98953902db81271cc2e80e0b486128e444705bda62ca108546e4c76432047' 
  AND token = 'glY115njI3P0cSK9w8zz8PR0DBdrbPjPES5bqa7tHuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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