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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ce3f59af0191b054bbbdfe717f7ed7e2c7ab674ad1a1570535ab4bb2e22ef6' 
  AND token = 'e+SAHXBQ70lZVCZ5sPS2eXfHv+AW+6Ai9ZRZZ00X8Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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