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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8485643f6cf98ffc69276983849dda6470cbb25e9138a8134cf9a3f53131c561' 
  AND token = 'Lw/XU3SFahPgo1erzTYQhr68kKG8R1EtwX0CczOSrIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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