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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31febafc9384af9903cacc8fc79e134aa59488e15c9de179026cbec55301ff5' 
  AND token = 'B9IC2dFGtKlESHb4VaOQ7mcoFH+JHcOGZm644t2a6i4=' 
  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"
    }
  }
}