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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c26a8f54a875d62291bd239f0f778c8af9647137d82abb5f33f60187d064e2' 
  AND token = 'O87JLWrnY6S/AcBQIei/4oXFtyOSb2z4icog7wnAhxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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